By default, Rails does not set a timeout on database statements. For example, this will run for a full day, even if your ruby process goes away.
ActiveRecord::Base.connection.execute(<<~SQL) select pg_sleep(86400); SQL
The good news is that Rails provides a way to prevent this from happening from the
database.yml with the
default: &default adapter: postgresql ... variables: statement_timeout: 5000
I'm starting to think that this should always be set low. And then explicitly set higher on a per-query basis, when one is expecting something to take a long time.